136 lines
4.1 KiB
Diff
136 lines
4.1 KiB
Diff
From bed63b636fedf47dbab899a5193ec5ec4539f6fc Mon Sep 17 00:00:00 2001
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From: Al Cooper <alcooperx@gmail.com>
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Date: Fri, 3 Jan 2020 13:18:09 -0500
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Subject: [PATCH] phy: usb: bdc: Fix occasional failure with BDC on 7211
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The BDC "Read Transaction Size" needs to be changed from 1024
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bytes to 256 bytes to prevent occasional transaction failures.
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Signed-off-by: Al Cooper <alcooperx@gmail.com>
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Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
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Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
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---
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.../phy/broadcom/phy-brcm-usb-init-synopsys.c | 18 +++++++++++++++
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drivers/phy/broadcom/phy-brcm-usb-init.h | 1 +
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drivers/phy/broadcom/phy-brcm-usb.c | 23 +++++++++++++++----
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3 files changed, 38 insertions(+), 4 deletions(-)
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--- a/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c
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+++ b/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c
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@@ -70,6 +70,11 @@
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#define USB_GMDIOCSR 0
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#define USB_GMDIOGEN 4
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+/* Register definitions for the BDC EC block in 7211b0 */
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+#define BDC_EC_AXIRDA 0x0c
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+#define BDC_EC_AXIRDA_RTS_MASK 0xf0000000
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+#define BDC_EC_AXIRDA_RTS_SHIFT 28
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+
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static void usb_mdio_write_7211b0(struct brcm_usb_init_params *params,
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uint8_t addr, uint16_t data)
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@@ -198,6 +203,7 @@ static void usb_init_common_7211b0(struc
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{
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void __iomem *ctrl = params->regs[BRCM_REGS_CTRL];
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void __iomem *usb_phy = params->regs[BRCM_REGS_USB_PHY];
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+ void __iomem *bdc_ec = params->regs[BRCM_REGS_BDC_EC];
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int timeout_ms = PHY_LOCK_TIMEOUT_MS;
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u32 reg;
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@@ -231,6 +237,18 @@ static void usb_init_common_7211b0(struc
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usb_init_common(params);
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/*
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+ * The BDC controller will get occasional failures with
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+ * the default "Read Transaction Size" of 6 (1024 bytes).
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+ * Set it to 4 (256 bytes).
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+ */
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+ if ((params->mode != USB_CTLR_MODE_HOST) && bdc_ec) {
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+ reg = brcm_usb_readl(bdc_ec + BDC_EC_AXIRDA);
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+ reg &= ~BDC_EC_AXIRDA_RTS_MASK;
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+ reg |= (0x4 << BDC_EC_AXIRDA_RTS_SHIFT);
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+ brcm_usb_writel(reg, bdc_ec + BDC_EC_AXIRDA);
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+ }
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+
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+ /*
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* Disable FSM, otherwise the PHY will auto suspend when no
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* device is connected and will be reset on resume.
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*/
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--- a/drivers/phy/broadcom/phy-brcm-usb-init.h
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+++ b/drivers/phy/broadcom/phy-brcm-usb-init.h
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@@ -19,6 +19,7 @@ enum brcmusb_reg_sel {
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BRCM_REGS_XHCI_GBL,
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BRCM_REGS_USB_PHY,
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BRCM_REGS_USB_MDIO,
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+ BRCM_REGS_BDC_EC,
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BRCM_REGS_MAX
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};
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--- a/drivers/phy/broadcom/phy-brcm-usb.c
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+++ b/drivers/phy/broadcom/phy-brcm-usb.c
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@@ -36,6 +36,7 @@ struct value_to_name_map {
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struct match_chip_info {
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void *init_func;
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u8 required_regs[BRCM_REGS_MAX + 1];
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+ u8 optional_reg;
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};
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static struct value_to_name_map brcm_dr_mode_to_name[] = {
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@@ -71,7 +72,7 @@ struct brcm_usb_phy_data {
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};
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static s8 *node_reg_names[BRCM_REGS_MAX] = {
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- "crtl", "xhci_ec", "xhci_gbl", "usb_phy", "usb_mdio"
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+ "crtl", "xhci_ec", "xhci_gbl", "usb_phy", "usb_mdio", "bdc_ec"
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};
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static irqreturn_t brcm_usb_phy_wake_isr(int irq, void *dev_id)
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@@ -271,6 +272,7 @@ static struct match_chip_info chip_info_
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BRCM_REGS_USB_MDIO,
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-1,
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},
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+ .optional_reg = BRCM_REGS_BDC_EC,
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};
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static struct match_chip_info chip_info_7445 = {
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@@ -300,7 +302,8 @@ static const struct of_device_id brcm_us
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static int brcm_usb_get_regs(struct platform_device *pdev,
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enum brcmusb_reg_sel regs,
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- struct brcm_usb_init_params *ini)
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+ struct brcm_usb_init_params *ini,
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+ bool optional)
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{
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struct resource *res;
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@@ -317,7 +320,13 @@ static int brcm_usb_get_regs(struct plat
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return 0;
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}
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if (res == NULL) {
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- dev_err(&pdev->dev, "can't get %s base address\n",
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+ if (optional) {
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+ dev_dbg(&pdev->dev,
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+ "Optional reg %s not found\n",
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+ node_reg_names[regs]);
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+ return 0;
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+ }
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+ dev_err(&pdev->dev, "can't get %s base addr\n",
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node_reg_names[regs]);
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return 1;
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}
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@@ -460,7 +469,13 @@ static int brcm_usb_phy_probe(struct pla
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break;
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err = brcm_usb_get_regs(pdev, info->required_regs[x],
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- &priv->ini);
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+ &priv->ini, false);
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+ if (err)
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+ return -EINVAL;
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+ }
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+ if (info->optional_reg) {
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+ err = brcm_usb_get_regs(pdev, info->optional_reg,
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+ &priv->ini, true);
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if (err)
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return -EINVAL;
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}
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